how to find slope for each grid of a three dimensional matrix?

Sir I have a matrix of dimension 40*40*13 having spatial size 40*40 with 1 degree*1 degree resolution and 13 is the years from 2000 to 2012. Now I have to find out a trend line for each grid, Say y=mx+c, where m is the slope which i have to use so that i get a file having only slope of dimension 40*40. Please help me how to do it?

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on 3 Sep 2014

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